Red wool-dyestuff.



WILLY TROPJP, 0F HfiCHST-ON-THE-MAIN, GERMANY, AISSIGNOR T0 FBWERKJE WORM. MEISTER LUCIUS & BJRUNING, 01F HfiCHST-ON-THE-MAIN, GERMANY, A

CORPORATION OF GEMANY.

REID WOOL-DYJESTUFIF.

mean...

No Drawing.

To all whom it may concern:

]Be it known that ll, WILLY Tnorr, Ph. 1)., chemist, a citizen of the Empire of Germany, residing at HZichst-on-the-Main, Germany, have invented certain new and useful Improvements in Red Wool- Dyestuffs, of which the following is a specification.

I have found that a red wool-dyestu'fi of remarkable fastness to light can be obtained by acetylating the dyestufi of the formula:

obtainable, for instance, by reducing in alkaline solution the dyestufi obtained by combining p-nitranilin-o-sulfonic acid with 2.8.6.aminonaphtholsulfonic acid (see German Patent No. 95856). The new dyestuif thus obtainable is distinguished fromthe parentproduct by the tint it dyes, by its greater leveling power and by a cons1derably im roved fastness to light. The procedure or preparing said d estud may, for instance, be as follows: 48 ilos of the dyestud, obtainable by reducing in alkaline solution the dyestud derived from p-nitranilin-o-sulfonic acid with 2.8.6. aminonaphtholsulfonic acid, are dissolvedin 300 liters of water and to this solution are added 12 kilos of acetic anhydrid while w'ell stirring at 45 C. The temperature rises to about 49 C. at which it is kept for 1 hour. The

dyestufl' is then slowly precipitated by means I of 75 kilos of common salt. It separates in the form of crystals of a bronze color and after cooling it is pressed and dried.

The dyestud having the formula- Specification of Letters Patent.

Patented Jan. 5, Emil.

Application filed February 18, 191%. Serial No. 8193M.

brown powderof a metallic luster, it is soluhand 1.2 diamino-8-oxynaphtlialene- 6 sul-- fonic acid, and on the other hand, while eliminating the acetyl group, p-phenylenediaminsulfonic acid.

Having now described my invention what claim is:

As a new article of manufacture, the dyestufi of the formula:

being'in the form of its sodiumsalt a reddish-brown, powder of a' metallic luster,

soluble in water with a red color, scarcely soluble in concentrated sulfuric acid with a WILLY TRUPP.

' Witnesses: I

JEAN Gnrmn, CARL GRUND. 

